Research On Optimization Method Of Urban Conventional Public Transit Line Network In Near Future

Bus network design plays the decisive role in transit planning, and directly affects the decisive role of planning decision-making behind. It is the precondition of priority for public transport, and it is the basis for developing the public transport system service level and competition. The short-range optimization of the public transport route network has its specificity that is different from the long-range planning and the optimization of the current 'public transport route network, and whose research objects are concerned with both the individual bus line adjustment at the micro level and the net structure optimization at the macro level.This paper divided bus network optimization into three parts to discuss:the basis research of bus network optimization to confirm the short-range optimization method of the bus network and the optimization and adjustment of the current bus network.The basis research of bus network optimization is the foundation upon the bus network optimization, including the data of optimization and theoretical basis. Data basis mainly includes bus travel share amount and bus OD distribution. It is theory foundation of the short-range optimization method that is the common mode,method and goal of line network optimization.It is important that to confirm the method of the short-range optimization method of the bus network.Firstly, this paper confirms the research content and fixed number of year of the short-range optimization. Then this paper introduces the problems existing in the nowadays bus network construction goal and influencing factors of the short-range transit network optimization. Finally, this paper provides practical methods by analyzing particularity of the recent optimization and the optimization flow by combining the macroscopical planning and the microcosmic adjustment together.The research of existing transit network optimization. An evaluation is made to the public transportation line network system in Chengdu city with fuzzy comprehensive evaluation theories. Combining the fuzzy analysis for present statue adjustment, this paper investigates systematically adjusting principle and method for bus network, and meanwhile conventional transit network adjusting method cooperating with rail transit and applied this method on the Chengdu Subway No.1 line.